Watch Bono and Chris Martin Duet on ‘Jimmy Kimmel Live’

U2 frontman Bono and Coldplay counterpart Chris Martin performed a duet version of the Frank Sinatra classic “One for My Baby” during an AIDS awareness edition of Jimmy Kimmel Live on Nov. 29. You can watch the performance – including a surprise cameo appearance by actor Sean Penn – above.

The episode aimed to raise money for Project (RED), the relief charity founded by Bono, which is why the studio set focused on that color. As part of the campaign he’s inviting fans to bid on an experience prize of a round of mini-golf with him – and he insisted during the Kimmel appearance that he’s never played the game. Check out the full range of experiences on offer.

U2 released their latest album Songs of Experience today (Dec. 1) after a delay brought about because the band realized the world had changed dramatically while making it. “It’s hard to quantify, but I would say the emotional temperature is up about 25 percent,” Bono said in September. “There’s a couple of reasons why we delayed Songs of Experience. The world around us was certainly changing out of all recognition. We nearly lost the European Union, something that has helped keep the peace in our region for nearly 70 years. You’ve had the same sort of disaffection in the United States, with the rise of a new kind of constituency. People on both the left and right have lost faith in political process. These sentiments are easily played and manipulated by the likes of Donald Trump.”

Coldplay’s most recent world tour, which ended on Nov. 15, was recently confirmed as the third-highest grossing road trip of all time, grossing over $523 million – less than U2’s $736 million from 2009-2011 and the Rolling Stones’ $459 million from 2005-2007.